A is a point having an elevation of 130.48 m above datum, and b and C are points of unknown elevation, B is in between A and C. By means of an instrument set 1.22 m above B, vertical angles are observed, that to A being -14°45' and that to C being +8°32'. The horizontal distance AB is 547.20 and the horizontal distance BC is 923.25 m. Making due allowance for earth's curvature and atmospheric refraction. a) Compute the difference in elevation between A and B. b) Determine the difference in elevation between B and C. c) Determine the elevation of C.

A is a point having an elevation of 130.48 m above datum, and b and C are points of unknown elevation, B is in between A and C. By means of an instrument set 1.22 m above B, vertical angles are observed, that to A being -14°45' and that to C being +8°32'. The horizontal distance AB is 547.20 and the horizontal distance BC is 923.25 m. Making due allowance for earth's curvature and atmospheric refraction. a) Compute the difference in elevation between A and B. b) Determine the difference in elevation between B and C. c) Determine the elevation of C.

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Question

Using Trigonometric levelling.

A is a point having an elevation of 130.48 m above datum, and b and C are points of unknown elevation, B is
in between A and C. By means of an instrument set 1.22 m above B, vertical angles are observed, that to A being
-14°45' and that to C being +8°32'. The horizontal distance AB is 547.20 and the horizontal distance BC is 923.25
m. Making due allowance for earth's curvature and atmospheric refraction.
a) Compute the difference in elevation between A and B.
b) Determine the difference in elevation between B and C.
c) Determine the elevation of c.

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